Hi David,
I don't know much about Haplogroup Projects, so I'm afraid I can't comment directly on your question, but I'm hoping you might be able to help me. I administer the Petty Project at FTDNA, and the major (by far!) haplogroup lineage in the Project is I-BY34474, a distant subclade of I-M253 which is associated with a 17th century English immigrant to America, Hubert Petty (Petty-7). This line currently includes over two dozen of our Petty Project members, who have a total of 11 different identified subclades of BY34474 between them, in 4 "levels." (Unfortunately, I've only been able to talk three of these members into joining WikiTree.) I'm considering creating a new FTDNA Haplogroup Project for this specific lineage, but don't know if there would be any real advantage to that. As a Haplogroup Project Admin, can you offer any advice on that?
Thanks,
-Bob Petty